EP1418776B1 - Frequency reuse method in an orthogonal frequency division multiplex mobile communication system (OFDM) - Google Patents

Frequency reuse method in an orthogonal frequency division multiplex mobile communication system (OFDM) Download PDF

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Publication number
EP1418776B1
EP1418776B1 EP20030078518 EP03078518A EP1418776B1 EP 1418776 B1 EP1418776 B1 EP 1418776B1 EP 20030078518 EP20030078518 EP 20030078518 EP 03078518 A EP03078518 A EP 03078518A EP 1418776 B1 EP1418776 B1 EP 1418776B1
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Prior art keywords
frequency
ofdm
sub
groups
channel
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German (de)
English (en)
French (fr)
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EP1418776A1 (en
Inventor
Chan-Soo 303-1704 Jugong Apt. Hwang
KI-Ho 2-1101 Samsung Apt. Kim
Young-Soo 3-807 Sanga Apt. Kim
Won-Hyoung 1502 Mextel Park
Sang-Boh 1003-401 Samsung Apt. Yun
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/12—Fixed resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation

Definitions

  • the present invention relates generally to a frequency reuse method in a mobile communication system, and in particular, to a frequency reuse method in an orthogonal frequency division multiplex (OFDM) mobile communication system.
  • OFDM orthogonal frequency division multiplex
  • Mobile communication systems are designed to provide voice service, ensuring mobility for users. Owing to the drastic development of mobile communication technology and ever-increasing user demands, these mobile communication systems have been developed to additionally provide data service. Data transmission has been evolved from short messages to Internet service. Today, high-rate data transmission such as moving pictures is possible. Transmission schemes, developed from traditional cellular systems, are now under discussion for standardization in the 3 rd generation partnership project (3GPP).
  • the 3G mobile communication systems are categorized into synchronous code division multiple access (CDMA) and asynchronous CDMA.
  • OFDM is a type of multi-carrier modulation.
  • OFDM spread spectrum technology distributes data over multiple carriers spaced from each other with respect to a central frequency, thereby offering orthogonality between the carriers.
  • the OFDM has excellent performance in a multi-path radio environment. For this reason, the OFDM attracts much interest as a suitable modulation scheme for digital terrestrial television service and digital audio broadcasting. Hence it is expected that the OFDM will be adopted as a digital television standard in Europe, Japan, and Australia and is currently envisioned for use in a fourth generation mobile communications system.
  • the OFDM has the following advantages.
  • one base station can not use all of the available OFDM frequency channels in view of the orthogonality of frequencies used. If a total of 512 frequency channels are available and 4 or 32 frequency channels, here 4 frequency channels are assigned to one user, up to 128 resources are available to a BS. In the case where each BS is allowed to use the 128 resources, the same frequency resources may be used in different BSs. Supposing that there are BS A and BS B adjacent to BS A, both BSs may assign the same 4 channels to mobile stations (MSs) within their cells. If the MSs are near to each other, they experience deterioration of carrier-to-interference ratio (C/I) characteristics.
  • C/I carrier-to-interference ratio
  • each BS adaptively assigns carriers according to interference.
  • the BS assigns a higher priority to an unused frequency in an adjacent BS. It further prioritizes frequencies used in adjacent BSs according to distances between MSs within its cell and those within the adjacent cells.
  • the BS assigns higher-priority frequencies before lower-priority ones.
  • the BS must predetermine the frequencies that adjacent BSs are using and calculate the distances between an MS being serviced within its cell and MSs being serviced within the adjacent cells. As a result, system complexity is increased.
  • Fig. 1 illustrates a conventional frequency reuse scheme with a frequency reuse distance of 3 in an OFDM cellular mobile communication system.
  • a complete frequency bandwidth is partitioned into three parts.
  • a third of the bandwidth is available to each BS so that each of BSs 110 to 160 uses a different frequency from those of its adjacent BSs.
  • BS 100 uses a third of the carrier indexes and its adjacent BSs 120 to 160 use the other two thirds of carrier indexes. Similar system design occurs at the other BSs.
  • the frequency reuse distance is 3.
  • cellular systems implement frequency reuse with a longer frequency distance based on this principle.
  • the above conventional frequency reuse scheme has the distinctive shortcoming that the entire frequency bandwidth cannot be fully utilized in each cell.
  • the number of channels available to a particular BS is the number of serviceable users or the data rates of services. Therefore, the decrease of the number of available channels limits the number of serviceable users or the data rates.
  • EP 0 782 360 A1 discloses a system and method for a cellular wireless communications system wherein each cell is divided in an inner cell and an outer cell. Reuse partitioning of frequency resources is employed to minimize neighbor-channel interference.
  • WO 02/ 49306 A2 discloses a method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA).
  • Subcarriers are partitioned into a plurality of groups and each group comprises at least one cluster of subcarriers.
  • a subscriber may indicate a selection of one or more groups.
  • At least one cluster is then allocated for use in communication with the subscriber.
  • US 5 953 661 discloses a system and method for operating a cellular communication system.
  • Cells of said cellular communication system are divided into outer cells and inner cells.
  • At least two frequency reuse patterns are assigned to the cells, one pattern to the outer cells and another, tighter pattern to the inner cells.
  • an object of the present invention to provide a method of increasing frequency reuse in an OFDM mobile communication system.
  • Frequency resources available to each BS are divided into at least four frequency groups and a frequency reuse distance is set for each of the frequency groups.
  • the frequency reuse distance set for each of the frequency group can be the same or different.
  • the frequency groups are sequentially assigned to cell areas of each BS such that lower frequency groups are available to a near cell area and higher frequency resource groups are available to a remote cell area.
  • Each of the frequency groups includes successive carriers.
  • the frequency resources are divided into the at least four frequency groups according to frequency hopping patterns.
  • At least one of the frequency groups is used with a frequency reuse distance of I in the near cell area.
  • the near cell area is defined according to one of the distance from the BS, a system-required carrier-to-interference ratio (C/I), or interference from an adjacent BS.
  • the at least four frequency groups are of the same size.
  • a BS having first frequency resources for a near cell area and second frequency resources for a remote cell area, determines one of the distance between the BS and an MS, received signal strength, or interference from an adjacent BS, upon request of the MS for OFDM frequency setup. If a predetermined condition is satisfied, the BS establishes a channel with the MS by assigning a first OFDM frequency resource to the MS. If the MS is outside of the near cell area, the BS establishes a channel with the MS by assigning a second OFDM frequency resource to the MS.
  • each BS communicating with MSs in OFDM, having at least two sub-channel groups, and assigning OFDM frequency resources to an MS requesting a communication
  • the BS compares the SIR of an MS with a predetermined reference SIR, upon request for an OFDM frequency setup from the MS, and assigns OFDM frequency resources in a low sub-channel group to the MS if the SIR of the MS is lower than the reference SIR.
  • the BS assigns to the MS OFDM frequency resources in a sub-channel group corresponding to the lowest of reference SIRs higher than the SIR of the MS.
  • the sub-channel group for the MS is determined according to the SIR and lognormal fading-including signal loss of the MS.
  • an OFDM frequency reuse distance can be 3, 4, 7, ....
  • hexagonal-shaped cells are artificial and such a shape cannot be generated in the real world, that is, each BS has a different shape of cell coverage, the ideal hexagonal cell shapes are assumed herein.
  • Fig. 2 illustrates a frequency reuse scheme in an OFDM mobile communication system according to an embodiment of the present invention.
  • a given frequency bandwidth is partitioned into four carrier index groups n 1 to n 4 in order to obtain two frequency reuse distances of 3 and 1. If any other frequency reuse distances are adopted, the frequency bandwidth is partitioned into more or less parts.
  • the reason for using the two frequency reuse distances is to achieve a satisfactory C/I at cell borders or cell edges when the frequency reuse distance of 3 is used. As the system requires a higher C/I level, or propagation loss and fading variance are great, a greater frequency reuse distance, should be used.
  • the frequency reuse distance is varied according to the configuration of the BSs (i.e., propagation distance, propagation losses, fading variance, system-required C/I, and distance between BS and MS).
  • a different frequency reuse distance is used according to the distance from a BS.
  • OFDM carriers are assigned with a frequency reuse distance of 1 in a near cell area and with a frequency reuse distance of 3 in a remote cell area.
  • the cell area can be divided according to C/I instead of the distance. In this case, the cell area is divided into a good channel-condition area and a bad channel-condition area. Since the C/I varies with the layout of buildings and the type of geographic terrain contour, the shapes of cell area coverages are different, which will be described later with reference to Fig. 5.
  • the frequencies of carrier index group n 1 are used in an area apart from each BS by a predetermined distance or less with a frequency reuse distance of 1.
  • the areas are called “near areas (inner cells)" which are circular with respect to the BSs 200 to 260.
  • the remaining areas are called “remote areas (outer cells).”
  • MSs within the near areas generally have good C/I characteristics.
  • the distinction between the near areas and the remote areas can be made by system-required C/I and interference from adjacent BSs, instead of distance.
  • Fig. 3 illustrates a cell which is divided into a near area and a remote area according to distance from a BS in the present invention.
  • the cell 200a of the BS 200 covers its signal propagation distance.
  • the cell coverage is divided into a near area 200b with a radius r that is changed according to the characteristics and geographical features of the BS 200.
  • the remaining area outside of the near area 2006 of the cell coverage is defined as a remote area.
  • application of the frequency reuse distance of 1 to the near area 200b does not affect MSs within other cells.
  • OFDM frequencies are reused in the remote areas as done in the conventional frequency reuse scheme.
  • OFDM frequencies are assigned to the remote areas of the BSs 200 to 260 without overlapped areas.
  • the carrier index groups n 2 , n 3 and n 4 are available to BSs 200 to 260.
  • each BS assigns a channel to an MS in its remote area within resources assigned to the BS. For example, if the carrier index group n 2 is available to BS 200, BS 200 assigns a channel within the available frequency band to an MS in its remote area.
  • BS 200 assigns a channel within the carrier index group n 1 to the MS.
  • the carrier index group n 3 is available to BS 210, the BS 210 assigns a channel in the carrier index group n 1 to an MS in its near area and a channel in the carrier index group n 3 to an MS in its remote area, as illustrated in Fig. 2.
  • Fig. 5 illustrates a cell that is divided into a near area and a remote area according to signal strength or C/I in the present invention.
  • the distance-based near area 200b and a C/I-based near area 200C have different borders due to the channel condition between BS 200 and an MS, propagation loss, and the geographical features. While not shown, cell coverage 200a is also different in the real world for the same reason.
  • the near and remote areas are defined according to the distance from the BSs and the following description is also based on this assumption, even though the near and remote areas have different shapes depending on various factors.
  • the complete frequency bandwidth is partitioned into a predetermined number of carrier index groups.
  • One of the carrier index groups is used with a frequency reuse distance of 1 and the other carrier index groups, with a frequency reuse distance of 3. In case of non-hexagonal-shaped cell coverage, a frequency reuse distance higher than 3 should be used. Then the complete spectrum available is partitioned into (frequency reuse distance +1) parts. While the frequency bandwidth is equally partitioned in this embodiment, the divided carrier index groups may have different sizes considering the geographical features of the cells.
  • Fig. 6 illustrates clusters of cells with frequency reuse distances of 1 and 3 in an OFDM mobile communication system using frequency hopping according to another embodiment of the present invention.
  • each carrier index group consists of discontinuous carriers in the second embodiment.
  • the complete spectrum is partitioned into three carrier index groups, G1, G2 and G3.
  • Each carrier index group includes carriers spaced from each other by a predetermined bandwidth.
  • the carrier index groups G1, G2 and G3 are formed according to frequency hopping patterns. Using these carrier groups, different frequency reuse distances are achieved.
  • the carrier group G1 is used in the near areas of BSs 200 to 260 with a frequency reuse distance of 1 and the carrier groups G1, G2 and G3 are used in the remote areas with a frequency reuse distance of 3.
  • the use of frequency hopping effects interference averaging. Therefore, the near areas with the frequency reuse distance of 1 can be widened.
  • the near areas are defined according to the distance from the BS or system-required C/I.
  • n 1 and n 2 are the numbers of resources available to the near area and remote area, respectively.
  • n 1 and n 2 are integers.
  • ⁇ 1 and ⁇ 2 are the probabilities of generating any event in the near area and the remote area, respectively.
  • j is a parameter for summation, ranging from 1 to n 1 or from 0 to n 2 .
  • the Erlang B formula is represented as a graph illustrated in Fig. 4. Referring to Fig. 4, the blocking probability is always positive and the graph is given as a downwards convex parabola. Therefore, the cost is minimized at the apex of the parabola (i.e., zero differential of the cost function).
  • the use of the single frequency reuse distance 1 will be compared with the use of the different frequency reuse distances 1 and 3 in combination.
  • n channels are divided into a greater number of sub-channels than in the conventional frequency reuse scheme by further defining an area with the frequency reuse distance of 1.
  • the number of channels available specifically to each BS is decreased.
  • n 1 +n 2 frequencies are eventually available to each BS.
  • the total number of carriers available to each BS is increased in effect. This was simulated as follows.
  • the total number of OFDM frequencies is 512 and 4 or 32 channels are available to one user.
  • the total number of available resources is then 128.
  • System load is the ratio of traffic generated per unit time to the total number of available channels. If r is between 0.3 and 0.4 for the frequency reuse distance of 1, the blocking probability is less than that when the frequency reuse distance is 3. If r is increased to 0.9 and the blocking probability is fixed to 0.02, the BS capacity is four times greater than that when the frequency reuse distance is 3.
  • Frequency resources are assigned to an MS according to one of the distance between the MS and a BS, received signal strength, or interference from adjacent BSs. While the given bandwidth is partitioned into (frequency reuse distance +1) parts, it can be partitioned into more parts. In addition, while the frequency resources are classified into two types, it is obvious that they can be divided into more types.
  • frequencies in different carrier groups are assigned to an MS in a near area and an MS in a remote area, respectively.
  • the frequency resources of two types can be assigned to MSs according to received signal strength, or interference from other adjacent BSs.
  • MSs are sorted according to the above criteria and the frequency resources are assigned correspondingly
  • OFDM frequency resources in a sub-channel group having the lowest of reference SIRs higher than the SIR of an MS are assigned to the MS.
  • the resulting low signal interference leads to a sufficiently high SIR. In this case, even if traffic load is great, the MS has a substantially low error rate. However, as the MS moves farther from the BS, the channel interference from the adjacent cells increases, resulting in a lower SIR. Therefore, the interference should be reduced for the MS.
  • Fig. 7 is a view illustrating a sub-channel assigning method according to a third embodiment of the present invention.
  • the BS is divided into the inner cell 200b and the outer cell 200a.
  • the area division is made according to traffic load, not distance even though the division criterion is shown to be distance due to representational difficulty.
  • the inner and outer cells can be defined considering distance additionally.
  • Available sub-channels (carriers) are divided into two different groups n 1 and n 2 .
  • Frequencies within the frequency group n 2 are assigned to MSs 301 to 304 in the outer cell 200a by frequency hopping 320.
  • frequencies within the frequency group n 1 are assigned to MSs 311,312 and 313 in the inner cell 200b by the frequency hopping 320.
  • the loads of n 1 and n 2 are controlled by adjusting the number of sub-channels in the respective sub-channel groups. If each sub-channel group has the same number of sub-channels, the load can be controlled by changing the number of users supported by the sub-channel group. In the case of a high average traffic, an optimum load for a high-load sub-channel group is about 1.0. When adjusting the load, the lowest of the SIRs of users using the high-load sub-channel group should be equal to or higher than the lowest of the SIRs of users using the low-load sub-channel group.
  • r is a value obtained by dividing the distance between a BS and an MS by the half of the distance between the cell of the BS and its adjacent cell.
  • d is the distance between the BS and the MS and c is a constant determined by a frequency and an environment, and a is a path loss exponent. If ⁇ is 2, the channel model is equivalent to a free space model.
  • the SIR of an MS spaced from the BS by r is expressed as 1 r a 2 p [ ( 1 3 ⁇ r ) a + ( 1 3 + r 2 ⁇ 3 r ) a + ( 1 3 + r 2 + 3 r ) ⁇ ]
  • a target SIR is s.
  • N sub-channels must be arranged in the manner that maximizes p. If N sub-channels are available, N 1 sub-channels are assigned to users spaced from the BS by r or below and N 2 sub-channels are assigned to users spaced from the BS by a distance longer than r. Then, the loads are r 2 N P /N 1 and (1-r 2 )N P /N 2 , respectively. Computation of SIRs at the edges of the inner cell and the outer cell by Eq.
  • r and N 1 are determined such that values calculated by Eq. (5) and Eq. (6) are minimized and thus a minimum SIR is obtained. That is, optimization can be carried out in two ways.
  • an x axis represents the quotient of dividing the distance between a BS and an MS by the distance between the BS and the remotest MS
  • a y axis represents the quotient of dividing the number of sub-channels assigned to a high-load frequency hopping group by the number of entire sub-channels
  • a z axis represents SIR.
  • the SIR at the highest point of a curve 400 is 50dB and the SIR at the lowest point of the curve 40 is -20dB.
  • an x axis represents the quotient of dividing the distance between a BS and an MS by the distance between the BS and the remotest MS
  • a y axis represents the quotient of dividing the number of sub-channels assigned to a high-load frequency hopping group by the number of entire sub-channels.
  • the SIR of a curve 500 nearest to the origin is 50dB
  • the SIR of a curve 510 remotest from the origin is -5dB.
  • SIR gain changes with respect of the change of an average load as illustrated from Figs. 8 and 9 are tabulated below.
  • Load is an overall average load
  • Previous SIR is an SIR at a cell edge when the inventive sub-channel assignment is not applied
  • Current SIR is an SIR at the cell edge when the inventive sub-channel assignment is applied.
  • Gain is the difference between Previous SIR and Current SIR
  • r is a value obtained by dividing the distance between a BS and an MS by the half of the distance between cells.
  • N 1 /N is obtained by dividing the number of sub-channels assigned to a high-load area by the number of entire sub-channels.
  • Inner load inner the load of a high-load area (in general, the load of a frequency hopping group assigned to a user within a cell). As noted from Table 1, the inventive sub-channel assignment brings an SIR gain of about 3dB.
  • OFDM frequencies are partitioned into a predetermined number of parts and each cell is divided into a near area and a remote area.
  • a frequency reuse distance of 1 is used and for the remote area, a different frequency reuse distance is used.
  • frequency hopping is adopted, frequencies are reused in the same manner except that each divided carrier index group has discontinuous carriers. Consequently, frequency utilization is increased.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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EP20030078518 2002-11-07 2003-11-07 Frequency reuse method in an orthogonal frequency division multiplex mobile communication system (OFDM) Expired - Lifetime EP1418776B1 (en)

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KR20020068830 2002-11-07
KR2002068830 2002-11-07
KR1020030075845A KR20040041009A (ko) 2002-11-07 2003-10-29 이동통신 시스템에서 오에프디엠 주파수 재사용 방법
KR2003075845 2003-10-29

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EP1418776B1 true EP1418776B1 (en) 2006-03-22

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